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Summary of Significant Accounting Policies (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Summary of Significant Accounting Policies [Abstract] |  |  |  |
Foreign currency translation, Beginning balance |  | $ (69,417) | $ (67,895) |
Foreign currency translation, Other comprehensive income (loss) before reclassifications |  | (16,627) | 15,473 |
Other comprehensive income (loss), Foreign currency transaction and translation adjustment, net of tax |  | (16,627) | 15,473 |
Reclassification of foreign currency translation associated with noncontrolling interest acquired |  |  | (16,995) |
Foreign currency translation, Ending balance |  | (86,044) | (69,417) | $ (67,895)
Unrealized gain (loss) on hedging activities, Beginning balance |  | (143) | (18) |
Unrealized gain (loss) on hedging activities, Other comprehensive income (loss) before reclassifications |  | 1,448 | 509 |
Unrealized gain (loss) on hedging activities, Amounts reclassified from accumulated other comprehensive loss |  | (1,013) | (634) |
Unrealized gain (loss) on hedging activities, Net other comprehensive income (loss), net of tax | [1] | 435 | (125) | (408)
Unrealized gain (loss) on hedging activities, Ending balance |  | 292 | (143) | (18)
Benefit plan liability adjustments, net |  |  |  | (84)
Accumulated other comprehensive income (loss), Beginning balance |  | (69,560) | (67,913) |
Total, Other comprehensive loss before reclassifications |  | (15,179) | 15,982 |
Total, Amounts reclassified from accumulated other comprehensive loss |  | (1,013) | (634) |
Total, Net other comprehensive loss, net of tax |  | (16,192) | 15,348 |
Accumulated other comprehensive income (loss), Ending balance |  | $ (85,752) | $ (69,560) | $ (67,913)
[1] | Net of tax expense (benefit) of $156, $(68) and $(10) for the years ended December 31, 2018, 2017 and 2016, respectively.

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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994 + Details
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- Definition Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32022-110900 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 + Details
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